666584231 has 4 divisors (see below), whose sum is σ = 667320072.
Its totient is φ = 665848392.
The previous prime is 666584209. The next prime is 666584251. The reversal of 666584231 is 132485666.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-666584231 is a prime.
It is a super-2 number, since 2×6665842312 = 888669074035722722, which contains 22 as substring.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (666584251) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 366560 + ... + 368373.
It is an arithmetic number, because the mean of its divisors is an integer number (166830018).
Almost surely, 2666584231 is an apocalyptic number.
666584231 is a deficient number, since it is larger than the sum of its proper divisors (735841).
666584231 is an equidigital number, since it uses as much as digits as its factorization.
666584231 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 735840.
The product of its digits is 207360, while the sum is 41.
The square root of 666584231 is about 25818.2925655435.
The cubic root of 666584231 is about 873.5444561581.
The spelling of 666584231 in words is "six hundred sixty-six million, five hundred eighty-four thousand, two hundred thirty-one".